/Engine/Source/Runtime/Engine/Classes/Kismet/KismetTextLibrary.h
This exists to allow programmatic look-up of a string table entry from dynamic content - you should favor setting your string table reference on a text property or pin wherever possible as it is significantly more robust (see "Make Literal Text").
The found text, or a dummy text if the entry could not be found.
static [FText](API\Runtime\Core\Internationalization\FText) TextFromStringTable ( const [FName](API\Runtime\Core\UObject\FName) TableId, const [FString](API\Runtime\Core\Containers\FString) & Key )